In the accompanying video, scientists used SXS (Simulating Extreme Spacetimes) to portray the merging of 2 black holes.
As the two black holes begin to approach each other, it begins to rotate, taking a position in the center. They then merge to form a larger black hole. The surface area of the new black hole formed will be the sum of the surface area of the two merging black holes. This black hole is a result of the existence of the “field” Law of thermodynamics.
The light detection tools used by telescopes and astronomers cannot be observed because black holes and black hole mergers are completely dark. With the most precise measuring devices, the gravitational waves emitted by this event travel throughout the universe, reaching and capturing the Earth.